Just had a new out of the box 788ci HD installed this week on my console at my local boat dealership, with temp probe running out the back of the transom. First time on the water this morning, everything, including temp, doing fine. (Water temp was 80.2F displayed on the unit, which matched with a Lowrance unit I also have on the boat). After a few hours it started reading between 110-120 degrees F. Then eventually the temp display disappeared from the temp windows. From the System Status Accessory Test page it now shows "Temperature UNCONNECTED". I've confirmed no pins are bent on the head unit, I uploaded latest software (6.640), and confirmed that the temp sensor is still there. I think what I might have witnessed is a melt-down of the temp sensor and I will have to get it replaced. This is unfortunate as it is a brand new unit and such an effort to get the boat in to the dealer. I searched through this forum and was hoping to find the magic answer that would fix me up. I have initiated an inquiry in through Humminbird service website. Any thoughts? Thanks in advance.